Timeline for Maxwell stress tensor on a capacitor late given a dielectric
Current License: CC BY-SA 4.0
2 events
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| Jun 30 at 5:18 | comment | added | asyndeton256 | I don't believe that's correct? My understanding of the Feynman lectures is that, assuming a constant voltage, the charge on each plate increases by $\varepsilon_r$, but that the electric field actually decreases by $\varepsilon_r$ relative to the charge on each plate (Eq. 10.27). From the equation above 10.10 (and from my FEA sims), $V = Ed$ still even with a dielectric. Every derivation I've seen for the force uses the energy method (Eq. 10.28/10.30), which indeed gives the factor $\varepsilon_r^2/\varepsilon_r = \varepsilon_r$, but the Maxwell stress tensor method remains a mystery to me. | |
| Jun 29 at 4:53 | history | answered | Spehro Pefhany | CC BY-SA 4.0 |